Ventilation fan housing



FIG. 1 is a top, left, front axonometric view of a ventilation fan housing showing my new design.

FIG. 2 is a front view thereof.

FIG. 3 is a rear view thereof.

FIG. 4 is a right side view thereof.

FIG. 5 is a left side view thereof.

FIG. 6 is a top plan view thereof; and,

FIG. 7 is a bottom plan view thereof.

The broken lines illustrate portions of the ventilation fan housing and environmental structure. None of the broken lines form part of the claimed design. 

CLAIM The ornamental design for a ventilation fan housing, as shown and described. 